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Finding the Fourth Proportional to 942.21, 1,411.77 and 666.96

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Solution

The fourth proportional to 942.21, 1,411.77 and 666.96 is: 999.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.21 : 1,411.77 = 666.96 : x
  2. Step 2: Convert to fraction form
    942.21/1,411.77 = 666.96/x
  3. Step 3: Cross multiply
    942.21x = 1,411.77 × 666.96
  4. Step 4: Simplify right side
    942.21x = 941,594.12
  5. Step 5: Solve for x
    x = 941,594.12/942.21
  6. Step 6: Final answer
    x = 999.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.